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Computer-service businesses have been lobbying lawmakers since the end of the special session to repeal the new tax.

Business groups have joined with Comptroller Peter Franchot in saying the tax is a huge obstacle to expanding the technology sector of the state economy.

“But even worse is the impact on small businesses, who pay for their services,” Mrs. Forehand said.

Gov. Martin O’Malley, a Democrat, has opposed repealing the computer-services tax. He was scheduled to deliver a speech last night to supporters of the tax repeal.